A Simple Spectrophotometric Method for the Determination of Copper in Some Real, Environmental, Biological, Food and Soil Samples Using Salicylaldehyde Benzoyl Hydrazone. Pakistan Journal of Analytical & Environmental Chemistry, Pakistan, v. 13, n. 1, p. 22–35, 2025. DOI: 10.21743/. Disponível em: https://pjaec.pk/index.php/pjaec/article/view/385. Acesso em: 5 nov. 2025.